Preparation of Poly(vinyl acetate) Modified by Triethoxyvinylsilane and Properties of Copolymeric Lattices.

Copolymeric lattices of vinyl acetate-triethoxyvinylsilane were prepared using a batch, semicontinuous and deferred semicontinuous triethoxyvinylsilane monomer addition processes. The results showed that the stable latex with narrow particle distribution and high monomer conversion could be obtained only by the monomer addition process of deferred semicontinuous triethoxyvinylsilane. The experimental results revealed that the copolymerization reaction and the properties of latex and latex film were obviously influenced by triethoxyvinylsilane content. When the silicone content was less than 5 wt%, copolymerization proceeded readily and the obtained latex was stable. As increasing silicone content, monomer conversion and latex stability were decreased, whereas the water resistance was increased greatly. The ratio of absorbing water of poly(vinyl acetate) was 32.58 wt%, while copolymer of vinyl acetate-silicone (5 wt% silicone) was 13.96 wt%. It was obvious that the waterproof ability of poly(vinyl acetate) modified by low content of silicone was improved remarkably. IR Analysis of latex polymer confirmed the occurrence of copolymerization.